<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
    >
    </el-switch>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-button v-if="draggable" @click="saveBatch">批量保存</el-button>
    <el-tree
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :data="menus"
      :props="defaultProps"
      @node-click="handleNodeClick"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >
            Append
          </el-button>
    
          <el-button
         
            type="text"
            size="mini"
            @click="() => edit(data)"
          >
            edit
          </el-button>

          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            Delete
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分類名稱">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="圖標">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="計量單位">
          <el-input
            v-model="category.productUnit"
            autocomplete="off"
          ></el-input>
        </el-form-item>
      </el-form>
      <span>这是一段信息</span>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>



<script>
// import { url } from 'inspector';

import { readFileSync } from 'fs';

export default {
  data() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      title: "",
      dialogType: "", //edit,add
      category: {
        name: "",
        parentCid: 0,
        cat_level: 0,
        showStatus: 1,
        sort: 0,
        catId: null,
        icon: "",
        productUnit: "",
      },
      dialogVisible: false,
      menus: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
      expandedKey: [],
      maxLevel: 0,
    };
  },

  created() {
    this.getMenus();
  },

  methods: {

    batchDelete(){

      let catIds = []
      let checkedNodes = this.$refs.menuTree.getCheckedNodes()
      console.log("被选中的节点：",checkedNodes)
      for(let i=0;i<checkedNodes.length;i++){
         catIds.push(checkedNodes[i].catId)
      }

      this.$confirm(`是否批量删除【${catIds}】菜单？`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(()=>{
        this.$http({
        url: this.$http.adornUrl('/product/category/delete'),
        method: 'post',
        data: this.$http.adornData(catIds, false)
        }).then(({data}) => {
          this.$message({
            message:"菜单批量删除成功",
            type:"success"
          })
          this.getMenus()
        })
      })
      .catch(()=>{})
      
    },
    saveBatch() {
      //3.当前拖拽节点的最新层级
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜单顺序修改成功！",
          type: "success",
        });
        //修改成功刷新菜单
        this.getMenus();
        //设置需要默认展开的菜单
        this.expandedKey = this.pCid;
        //恢复默认值
        this.updateNodes = [];
        this.maxLevel = 0;
        // this.pCid = 0;
      });
    },
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if ((this.dialogType = "edit")) {
        this.editCategory();
      }
    },

    editCategory() {
      var { catId, name, icon, productUnit } = this.category;

      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData({ catId, name, icon, productUnit }, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜單修改成功",
          type: "success",
        });
        //關閉對話框
        this.dialogVisible = false;
        //刷新出新的菜單
        this.getMenus();

        //設置需要展開的菜單
        this.expandedKey = [this.category.parentCid];
      });
    },
    edit(data) {
      (this.dialogType = "edit"), (this.dialogVisible = true);
      this.title = "修改分類";

      //發送請求獲取當前節點最新數據
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
      }).then(({ data }) => {
        //請求成功
        console.log("要回顯的數據：", data);
        this.category.name = data.data.name;

        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.productUnit = data.data.productUnit;
        this.category.parentCid = data.data.parentCid;
      });

      console.log("要修改的數據", data);
    },
    handleNodeClick(data) {
      console.log(data);
    },

    //添加三級分類
    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.getMenus();
        this.$message({
          message: "添加菜單保存成功！",
          type: "success",
        });
      });
      this.dialogVisible = false;

      this.title = "添加分類";
      this.expandedKey = [this.category.parentCid];
      console.log("提交的三級菜單分類數據", this.category);
    },
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取到菜单数据！", data.data);
        this.menus = data.data;
      });
    },
    append(data) {
      (this.dialogType = "add"), (this.dialogVisible = true);
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;

      this.category.catId = null;
      this.category.name = "";
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.sort = 0;
      this.category.showStatus = 1;

      console.log("append", data);
    },

    remove(node, data) {
      var ids = [data.catId];

      this.$confirm(`是否删除【${data.name}】菜单？`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            //刷新出新的菜單
            this.getMenus();

            //設置需要展開的菜單
            this.expandedKey = [node.parent.data.catId];
            this.$message({
              message: "菜單刪除成功@@",
              type: "success",
            });
          });
        })
        .catch(() => {});
    },

    allowDrop(draggingNode, dropNode, type) {
      //判斷被拖動的當前節點，以及所在的父节点总层数不能大于3

      //1）被拖动的当前节点总层数
      console.log("", draggingNode, dropNode, type);
      this.countNodeLevel(draggingNode);

      let deep = Math.abs(this.maxLevel - draggingNode.catLevel) + 1;

      console.log(this);
      console.log("maxlevel", this.maxLevel);

      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },

    countNodeLevel(node) {
      //找到所有子节点，查出最大深度
      if (node.children != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
      return this.maxLevel;
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      //1.当前节点最新的父节点id
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }

      //2.当前拖拽节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.data.catLevel;
          if (siblings[i].leverl != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel,
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
      this.pCid.push(pCid);

      console.log("updateNodes:", this.updateNodes);

      console.log("tree drop: ", draggingNode, dropNode, dropType, ev);
    },

    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
  },
};
</script>
<style>
</style>